Method of purifying water.



FFICE.

PATENT JOHN WVILSON, OF NEW YORK, N. Y.

METHOD OF PURIFYING WATER.

SPECIFICATION forming part of Letters Patent No. 629,410, dated July 25,1899 Application filed November 28 1898. Serial No. 697,690. (Nospecimens.)

To all whom it may concern:

Be it known that 1, JOHN WILSON, a citizen of the United States,residing in the borough of Brooklyn, county of Kings, city and State ofNew York, have invented a new and useful Method of Purifying Water, ofwhich the following is a specification.

The object of myinvention is to render water potable or to increase itspotability, and also to purify it for other purposesas, for instance,for laundry use or employment in steam-generators.

In carrying out my improvement I take the Water, whether underatmospheric pressure, pneumatic pressure, hydraulic pressure, or anyother pressure, and add thereto an aqueous solution of sodic chloride,alumina, lime, its compounds or derivatives-such as chloride oflime,caustic lime,&c.-and sulphate of alumina. ThisI usein proportionssuitable to the character of the Water to be purified, and hence it isimpossible to give definite proportions. For example, I would suggestthat for water having'twenty grains of impurities to the gallon I maysuccessfully use one grain of sodic chloride, two grains of alumina, onegrain of lime, and one-half grain of sulphate of alumina. After thistreatment the water must be freed from impurities by settling,decantation, or filtration by means of any desirable apparatus.

Water containing impurities difierent in amountfrom the example givenmay be treated by taking a portion of such water in a graduatedtest-tube, adding sodic chloride, alumina, lime, and sulphate of aluminain the proportions above given, and, if that amount be insufficient toprecipitate, adding the same number of grains of each and proceeding inthat manner until a precipitate is formed. Additions of sodicchloride,alumina, lime,and sulphate of alumina will be made until theprecipitation shall have ceased. This process will be pursued with suchrapidity that the results will not be dependent upon the set= tling ofsuch impurities as may separate by gravitation. Thus I shall obtain theproper amount of sodic chloride, alumina, lime, and sulphate of aluminafor theimpurities. Having thus determined the proportion necessary forthe treatment of any water, I employ that proportion.

The method of treating the water is to add the sodic chloride,which willprincipally unite with any argillaceous matter and form chloride ofalumina, which precipitates quickly. The sulphate of alumina, which isalso a quick precipitant, acts to unite more particularly with thevegetable matter in the water, although it also acts to precipitate theargillaceous matter. The alumina is to take up any acid or to neutralizeany corrosive effect of any acid or acids that may be in the water. Thelime is to take up any acid that the alumina fails to unite with.

Wherever I use in my specification and claim the terms alumina andsulphate of alumina they are to be understood as not meaning any of thealums.

The sodic chloride, alumina, lime, and sulpate of alumina may beintroduced separately or together.

Any suitable apparatus may be used for carrying out my improvements.

What I claim as my invention is- The method of purifying waterconsisting in introducing into it sodic chloride, alumina, lime, andsulphate of alumina in suflicient quantities to precipitate theimpurities, and afterward separating the impurities from the water.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN WILSON. lVitnesses:

H. OoUTANr, GEO. E. ORUsE.

